Calculate the number of moles in 75. 0 g of dinitrogen trioxide.

Answer:

In the given reaction, Zinc (Zn) is being oxidized to Zinc ion (Zn2+). The oxidation half-reaction equation would be: Zn (s) → Zn2+ (aq) + 2e−. The species that should be included in the oxidation half-reaction equation are Zn (s) and Zn2+ (aq).

Explanation:

Among the given options, the statement that is NOT correct is "B. An object of high temperature is placed into the calorimeter."

An object of high temperature is placed into the calorimeter is not correct. Calorimetry is a process that measures the heat released or absorbed during a chemical or physical change. It involves an insulated container holding a liquid, usually water. The temperature change of the object and the water will be equal. The heat absorbed by the water is equal to the heat lost by the object. Calorimetry is an experimental method used to measure the heat energy produced or absorbed during a chemical or physical change. Calorimetry works on the principle of heat transfer between a reaction or physical process and a heat sink or calorimeter. Calorimetry involves an insulated container holding a liquid, usually water, and a thermometer used to measure the change in temperature of the water caused by the addition of heat. When heat is added to or removed from a system, it causes a temperature change in the system. Calorimetry is used in various fields such as food and beverage, medical research, material science, and others.

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Answer:

a ) 2Na +Cl2 ---->2NaCl

b) 63.8g

Explanation:

please let me know if the 2nd answer is right than I can explain it to u how I did it

Care should be taken not to overfill refrigerant storage cylinders due to several important reasons:

1. Safety Hazards

2. Environmental Impact

3. System Performance and Efficiency

4. Compliance with Regulations

1. Safety Hazards: Overfilling a refrigerant storage cylinder can lead to safety hazards. Refrigerants are typically stored under pressure, and overfilling can cause the cylinder to exceed its maximum capacity, resulting in a higher pressure than it can safely withstand. This increases the risk of cylinder rupture, leading to the release of the refrigerant, which can be hazardous to individuals in the vicinity. Refrigerants, especially certain types like chlorofluorocarbons (CFCs) or hydrochlorofluorocarbons (HCFCs), can pose health risks if inhaled or exposed to skin and eyes.

2. Environmental Impact: Many refrigerants used in air conditioning and refrigeration systems are known to be ozone-depleting substances (ODS) or potent greenhouse gases. Overfilling cylinders can result in the release of excess refrigerant into the environment, contributing to ozone depletion and climate change. Proper management of refrigerant quantities helps minimize environmental impact and ensures compliance with regulations aimed at protecting the ozone layer and reducing greenhouse gas emissions.

3. System Performance and Efficiency: Overfilling refrigerant cylinders can lead to improper charging of refrigeration or air conditioning systems. Incorrect refrigerant levels can adversely affect system performance and efficiency. Overcharged systems may experience higher pressures, which can strain components, reduce cooling capacity, and result in increased energy consumption. On the other hand, undercharged systems may not provide sufficient cooling or may cause compressor damage due to insufficient lubrication.

4. Compliance with Regulations: Overfilling refrigerant cylinders can lead to non-compliance with regulations set by environmental agencies and governing bodies. These regulations define the proper handling, storage, and disposal of refrigerants to minimize environmental impact and ensure the safety of personnel involved in refrigerant-related activities. Failing to adhere to these regulations can result in penalties, legal consequences, and reputational damage for individuals or organizations involved.

To prevent these risks, it is important to follow manufacturer guidelines and industry best practices when handling, storing, and transporting refrigerants. Properly trained personnel should ensure that refrigerant storage cylinders are filled to appropriate levels, taking into account factors such as cylinder capacity, safety requirements, and system specifications. Regular inspections, maintenance, and adherence to regulations can help mitigate the potential hazards associated with overfilled refrigerant cylinders and promote safe and sustainable practices in the industry.

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Answer:

Examples of how the ideas can be applied to the issues and practices of hydraulic fracturing for the acquisition of shale gas are;

Reuse; The produced water in obtained from oil and gas well production are reused for fracking, drilling, and if the water is good enough, it can be used for farming

Reduce; The use of recycled brine and water in drilling and fracking process reduces the application of freshwater in the those processes and reduces pollution of natural water sources

Recycle; Recycling involves creating products from waste. In the hydraulic fracturing process approximately 13 percent of the water produced and the flowback water are recycled to be used more than once thereby reducing the net consumption of freshwater

Explanation:

In hydraulic fracturing, also known informally as fracking, is the drilling method used in oil and gas well development process that makes use of water sand and chemical injection through the well bore to open and widen cracks in the bedrock formations in the areas around the wellbore.

Answer: 24.2109 g

Explanation:

Hydrogen has a molar mass of 1.007947 g/mol so since hydrogen gas has 2 hydrogens, you can multiple this by 2 and then multiply that by 12.01 to get the total mass of 12.01 moles of hydrogen gas.

The molecular formula of the compound is C6H6, which is benzene.

To determine the molecular formula, we need to first find the empirical formula and then determine the molecular formula based on the molar mass.

Assuming 100 g of the compound, the percentage composition by mass of carbon and hydrogen can be calculated as follows:

Mass of carbon = 92.3 g

Mass of hydrogen = 100 g - 92.3 g = 7.7 g

Next, we can convert the mass of each element to moles using their respective atomic masses:

Moles of carbon = 92.3 g / 12.01 g/mol = 7.69 mol

Moles of hydrogen = 7.7 g / 1.01 g/mol = 7.62 mol

To obtain the simplest whole number ratio of atoms in the compound, we divide the number of moles of each element by the smallest number of moles:

C: 7.69 mol / 7.62 mol ≈ 1

H: 7.62 mol / 7.62 mol = 1

Therefore, the empirical formula of the compound is CH.

To determine the molecular formula, we need to know the molar mass of the compound. The molar mass of the empirical formula CH is:

Molar mass of carbon = 12.01 g/mol

Molar mass of hydrogen = 1.01 g/mol

Molar mass of CH = (1 × 12.01 g/mol) + (1 × 1.01 g/mol) = 13.02 g/mol

To calculate the molecular formula, we divide the experimental molar mass (78.12 g/mol) by the empirical formula mass (13.02 g/mol):

Molecular formula factor = 78.12 g/mol ÷ 13.02 g/mol ≈ 6

The molecular formula is obtained by multiplying the subscripts in the empirical formula by the molecular formula factor:

Molecular formula = (C1H1) × 6 = C6H6

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Thermolysis, photolysis, and electrolysis are three different forms of breakdown reactions. A single source was cooked to yield two or more objects in each instance (decomposition).

Decomposition reactions happen when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium hydroxide (KClO3) is a typical technique used during laboratories to generate oxygen gas.

Below is a typical illustration of a thermal breakdown reaction. Calcite breaks down into calcareous dioxide and atmospheric co2 when heated. The production of quick lime, a crucial component in numerous industries, uses this procedure.

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Answer:

5.8

Explanation:

Answer:

The rollercoaster has the lowest kinetic energy at the top of the hill.

The rollercaoster has the highest kinetic energy at the bottom of the hill.

Explanation:

The kinetic energy of any solid body in motion is usually computed using this formula:

K.E = \(\frac{1}{2}mv^2\)

From this, we can see that it varies based on two major parameters - The mass of the moving object and the velocity of the moving object.

We can assume that the mass of the rollercoaster is constant since no one gets off and it does not shrink in its size during the ride.

This means that the variations in the K.E are mainly coming from its velocity.

At the top of the hill, the rollercoaster is moving at its slowest pace. hence, it has the lowest kinetic energy at the top of the hill.

However, at the bottom of the hill, the rollercoaster is moving its fastest, hence it has the highest kinetic energy at the bottom of the hill.

A shielded nucleus will have a reduced chemical shift and will absorb upfield from a deshielded nucleus.

The nucleus is the central part of an atom that contains most of its mass and all of its positive charge. It is composed of protons and neutrons, which are held together by a strong nuclear force. The number of protons in the nucleus determines the element that the atom belongs to, while the number of neutrons can vary and give rise to different isotopes of the same element. The properties of the nucleus are essential in determining the behavior of the atom in chemical and physical reactions. Nuclei can also undergo nuclear reactions such as fission and fusion, which release enormous amounts of energy and are the basis for nuclear power and nuclear weapons. The study of nuclei and their properties is known as nuclear physics and is a fundamental area of modern science.

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Liquid to gas - Boiling: The phase change from a liquid to a gas that occurs when the substance reaches its boiling point, resulting in the formation of vapor.

Solid to gas - Sublimation: The phase change from a solid directly to a gas without going through the liquid state.

Solid to liquid - Melting: The phase change from a solid to a liquid when heat is applied, causing the substance to transition from a rigid to a more fluid state.

Liquid to solid - Freezing: The phase change from a liquid to a solid when the substance loses heat, resulting in the formation of a solid crystal lattice.

Therefore, the correct match would be:

Liquid to gas - Boiling

Solid to gas - Sublimation

Solid to liquid - Melting

Liquid to solid - Freezing

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Answer: molecules get closer

Explanation:

Condensation is the process in which molecules of a gas slow down, come together, and form a liquid. When gas molecules transfer their energy to something cooler, they slow down and their attractions cause them to bond to become a liquid

hope this helps

pls mark me brainliest

Answer:

D. The molecules get closer together and move more slowly.

Answer:

1.79°C

Explanation:

Applying,

PV/T = P'V'/T'................. Equation 1

Where P = Initial presssure, V = Initial volume, T = Initial temperature, P' = Final pressure, V' = Final volume, T' = Final Temperature.

make T' the subject of the equation

T' = P'V'T/PV................ Equation 2

From the question,

Given: P = 760 mmHg (Standard pressure), T = 273 K (Standard temperature), V = 62.65 L, P' = 612 mmHg, V' = 78.31

Substitute these values into equation 2

T' = (612×78.31×273)/(760×62.65)

T' = 274.79 K

T' = (274.79-273) °C

T' = 1.79°C

The correct resonance structures for a protonated carbonyl compound include a carbon double bonded to a protonated oxygen with a positive charge and a lone pair, and a carbon double bonded to a protonated R group and single bonded to two hydroxy groups.

When a carbonyl group is protonated, it forms a structure that can be stabilized through several resonance structures. These resonance structures involve the movement of electrons, resulting in different possible arrangements of atoms in the molecule. One of these resonance structures involves a carbon double bonded to a protonated oxygen with a positive charge and a lone pair, with the carbon also bonded to an R group and a hydroxy group.

Another resonance structure involves a carbon double bonded to a protonated R group and single bonded to two hydroxy groups. This structure involves the movement of electrons from the carbonyl group to the R group, resulting in the formation of a carbocation bonded to two hydroxy groups.

The other two options, a carbocation bonded to R and two hydroxy groups, and a carbon double bonded to a protonated oxygen with a positive charge and a lone pair, with the carbon also bonded to an R group and a hydroxy group, are actually valid resonance structures of the protonated carbonyl compound. Therefore, the correct answer is that all of the given structures are resonance structures of the compound formed upon protonation of the carbonyl group.

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Answer:

- Rosalind Franklin

- Notting Hill, London, United Kingdom

- July 25 1920

- Rosalind Franklin made a crucial contribution to the discovery of the double helix structure of DNA, but some would say she got a raw deal. Biographer Brenda Maddox called her the "Dark Lady of DNA," based on a once disparaging reference to Franklin by one of her coworkers.

- 1953

- that today's researchers are able to use tools such as DNA sequencing and X-ray crystallography to investigate viruses such as SARS-CoV-2. Franklin's research career began in the physical sciences.

Explanation:

PLIZZ CAN YOU GIVE ME BRAINLIEST

1. White Women was not excluded from the original construction of the American political system. The correct option is (A) White Women.

Among the groups that were not excluded from the original construction of the American political system were white women, wealthy land-owning white males, and, to some extent, formerly enslaved blacks. Native Americans, on the other hand, were excluded and treated as second-class citizens.

2. Libertarianism emphasizes the idea that the government should take a "hands-off" approach in most if not all matters of economic prosperity. The correct option is (C) Libertarianism. Libertarianism is a political ideology that emphasizes the importance of individual freedom, limited government intervention, and free-market capitalism. It is an ideology that is diametrically opposed to socialism and believes that the government should not interfere in people's lives unless it is absolutely necessary.

3. The Iroquois Confederacy played a role in the development of the U.S. Constitution and the American Political System. The correct option is (B) The Iroquois Confederacy. The Iroquois Confederacy, a native North American tribe, was known for its confederate government system, which inspired the U.S. Constitution's framers.

The idea of a representative government, checks and balances, and the division of powers were all influenced by the Iroquois Confederacy.

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Answer:

Argon is a chemical element with the symbol Ar and atomic number 18.

Explanation:

Answer:

Avogadro's number is a very important relationshiptoremember: 1 mole = 6.022×1023 6.022 × 1023atoms, molecules, protons, etc.

...

Explanation:

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To determine the ratio of H2O to glucose, C6H12O6, first you need to solve for the unknown coefficients x1, x2, x3, and x4 using matrix methods , given the chemical equation for x1 and x4.

Given the chemical equationx1C6H12O6 + x2O2 → x3CO2 + x4H2OYou can determine the unknown coefficients x1, x2, x3, and x4 by writing equations for each element:Carbon (C):6⋅x1 + 0⋅x2 = 1⋅x3 + 0⋅x4Hydrogen (H):12⋅x1 + 0⋅x2 = 0⋅x3 + 2⋅x4Oxygen (O):6⋅x1 + 2⋅x2 = 2⋅x3 + 1⋅x4The above equations can be represented in matrix form as AX=B:6 0 1 0x1 0 x3 0 | 00 12 0 2 x1 x4 0 x2 | 0 6 2 1Then, the unknown coefficients can be solved using the following MATLAB code:X = [6 0 1 0; 0 12 0 2; 6 2 0 1; 0 0 0 6];B = [0; 0; 0; 6];X = inv(X);X = X * B;x1 = X(1);x4 = X(4);Thus, x1 = 1 and x4 = 6, which means that the ratio of H2O to glucose, C6H12O6, is x4/x1 = 6/1 = 6.

To determine the ratio of H2O to glucose, C6H12O6, you need to solve for the unknown coefficients x1, x2, x3, and x4 using matrix methods in MATLAB, given the chemical equation:x1C6H12O6 + x2O2 → x3CO2 + x4H2OThe coefficients can be determined by writing equations for each element present in the reaction. The element equation for carbon (C) can be given as:6⋅x1 + 0⋅x2 = 1⋅x3 + 0⋅x4The element equation for hydrogen (H) can be given as:12⋅x1 + 0⋅x2 = 0⋅x3 + 2⋅x4The element equation for oxygen (O) can be given as:6⋅x1 + 2⋅x2 = 2⋅x3 + 1⋅x4Then, the above equations can be represented in matrix form as AX=B:6 0 1 0x1 0 x3 0 | 00 12 0 2 x1 x4 0 x2 | 0 6 2 1where A is the coefficient matrix, X is the matrix of unknowns, and B is the matrix of constants.Using MATLAB code, the solution can be obtained by: X = [6 0 1 0; 0 12 0 2; 6 2 0 1; 0 0 0 6];B = [0; 0; 0; 6];X = inv(X);X = X * B;x1 = X(1);x4 = X(4);Thus, x1 = 1 and x4 = 6, which means that the ratio of H2O to glucose, C6H12O6, is x4/x1 = 6/1 = 6.

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Answer: A. 2.00 moles

Explanation:

To determine the number of moles of nickel in a 117 g Ni sample, we can divide the mass of the sample by the molar mass of nickel:

moles = mass ÷ molar mass

= 117 g ÷ 58.69 g/mol

= 2 moles

Therefore, there are approximately 2 moles of nickel in a 117 g Ni sample and the correct answer is A. 2.00 moles

It is important to note that the molar mass of a substance is defined as the mass of one mole of that substance. One mole of a substance is equal to \(6.022\) × \(10^{23}\) units of that substance, which is known as Avogadro's number. The molar mass of a substance is often used to convert between mass and number of moles, as shown in the calculation above.

Answer:

See Explanation

Explanation:

The rate of reaction means the same thing as the speed of a reaction. It refers to how quickly or slowly the reactants disappear or how quickly or slowly the products appear per unit time.

The equation of the reaction is; NO(g) + O3(g)→ NO2(g) + O2(g)

We can write differential equations to show the rate of disappearance of reactants or rate of appearance of products as shown below where the rate of reaction has been denoted as r;

r = -d[NO(g)]/dt = -d[O3(g)]/dt

OR

r = d[NO2(g)]/dt = d[O2(g)]

The negative signs shows that the concentration of reactants decreases with time while the positive sign shows that the concentration of products increases with time.

The 30-carbon precursor of the steroid nucleus is squalene. It is derived from the condensation of six molecules of isopentenyl pyrophosphate (IPP), a five-carbon building block.

Steroids are a class of organic compounds characterized by a specific fused ring structure known as the steroid nucleus. The 30-carbon precursor of this nucleus is squalene. Squalene is a naturally occurring hydrocarbon and serves as the starting point for the biosynthesis of various steroids, including cholesterol and steroid hormones. To understand how squalene is formed, we need to look at the biosynthetic pathway. Squalene is synthesized from the condensation of six molecules of isopentenyl pyrophosphate (IPP), which is a five-carbon building block. The condensation reaction is catalyzed by the enzyme farnesyl pyrophosphate synthase. This process results in the formation of a 30-carbon linear molecule called farnesyl pyrophosphate (FPP). FPP is then converted into squalene through a series of enzymatic reactions, including the action of squalene synthase. In conclusion, the 30-carbon precursor of the steroid nucleus is squalene. It is derived from the condensation of six molecules of isopentenyl pyrophosphate, which ultimately leads to the biosynthesis of various steroids in living organisms.

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Answer:

The answer is E) none of the above.

In all of the given reactions, mass and charge are conserved. The law of conservation of mass states that the mass of reactants must be equal to the mass of the products in a chemical reaction. The law of conservation of charge states that the total charge of the reactants must be equal to the total charge of the products.

In reaction A, the water molecule dissociates into a hydrogen ion (H+) and a hydroxide ion (OH-), but the total mass and charge are still conserved.

In reaction B, the reduction of CIO2 to Cl- is balanced by the oxidation of water to form OH-. The electrons and charge are conserved.

In reaction C, H2SO4 reacts with NaOH to form Na2SO4, H+ and OH-. The mass and charge are conserved.

In reaction D, ZnCl reacts with water to form ZnOH, H+ and Cl-. The mass and charge are also conserved.

The pH of a solution is a measure of the activity of hydrogen ions (H+) in the solution. pOH is a measure of the activity of hydroxide ions (OH-) in a solution.

To calculate pH and pOH, when [H+] = 0.025 M, we can use the equation pH + pOH = 14. First, we calculate pH. Since [H+] is given, we can calculate pH directly from [H+] using the equation pH = -log[H+]. Plugging in [H+] = 0.025 M gives pH = -log(.025) = 2.6.

Next, we can calculate the pOH. Since pH + pOH = 14, we can calculate pOH by subtracting pH from 14. Plugging in pH = 2.6 gives pOH = 14 - 2.6 = 11.4. Therefore, the pH and pOH of a solution with [H+] = 0.025 M are 2.6 and 11.4, respectively.

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Answer:

The electronegativity difference of the atoms in the bond.

Explanation:

Carbon is electropositive while Oxygen is highly electronegative, hence highly polar due to strong intermolecular forces.

The molecule is not symmetrical because it's dipole moments don't cancel out.

1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon is True.

A natural source of regenerated cellulose, such as wood and other associated agricultural products, is used to create rayon, a semi-synthetic material. Its molecules resemble those of cellulose. Viscose is another name for it. Viscose fibres and films come in a wide variety of types and grades. Some mimic the appearance and feel of organic materials including silk, wool, cotton, and linen. Artificial silk is a common name for the materials that resemble silk.

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Complete Question

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.

True

False

Answer:

a) 1s22s22p63s1

b) 3s² 3p¹

c) 1s22s22p63s23p3

d) 3s² 3p⁵

e) 3s2

f) 1s22s22p63s23p2

g) 1s22s22p63s23p4

h) 3s² 3p⁶

Answer:

Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from the fossilized, buried remains of plants and animals that lived millions of years ago. Because of their origins, fossil fuels have a high carbon content.

Explanation: